fix(core): add typo hint for -p with feature flags

Author: raushan728

src/cargo/core/workspace.rs

@@ -1890,7 +1890,24 @@ impl<'gctx> Workspace<'gctx> {
                 && !cli_features.all_features
                 && cli_features.uses_default_features)
             {
-                bail!("cannot specify features for packages outside of workspace");
+                let hint = specs
+                    .iter()
+                    .find_map(|spec| {
+                        self.members()
+                            .filter_map(|member| {
+                                edit_distance(spec.name(), member.name().as_str(), 2)
+                                    .map(|distance| (distance, member))
+                            })
+                            .min_by_key(|(distance, _)| *distance)
+                            .map(|(_, member)| {
+                                format!(
+                                    "\n\nhelp: a workspace member with a similar name exists: `{}`",
+                                    member.name()
+                                )
+                            })
+                    })
+                    .unwrap_or_default();
+                bail!("cannot specify features for packages outside of workspace{hint}");
             }
             // Add all members from the workspace so we can ensure `-p nonmember`
             // is in the resolve graph.

tests/testsuite/package_features.rs

@@ -781,8 +781,8 @@ fn non_member() {
 
 #[cargo_test]
 fn non_member_typo() {
-    // -p with a mistyped package name currently shows a misleading error
-    // without any hint about similar workspace member names.
+    // -p with a mistyped package name shows a helpful error hint
+    // about similarly named workspace members.
     let p = project()
         .file(
             "Cargo.toml",
@@ -801,6 +801,8 @@ fn non_member_typo() {
         .with_stderr_data(str![[r#"
 [ERROR] cannot specify features for packages outside of workspace
 
+[HELP] a workspace member with a similar name exists: `bar`
+
 "#]])
         .run();
 }